9.6  Investigating heterogeneity

9.6.1 Interaction and effect modification

9.6.2 What are subgroup analyses?

9.6.3 Undertaking subgroup analyses

9.6.4 Meta-regression

9.6.5 Selection of study characteristics for subgroup analyses and meta-regression

9.6.6 Interpretation of subgroup analyses and meta-regressions

9.6.7 Investigating the effect of baseline risk

9.6.8 Dose-response analyses